Mask for the inhalation of carbon dioxid



Y. HENDERSON.

MASK FOR THE INHALATION OF CARBON DIOXID.

APPLICATION FILED APR. 7. I920.

Patented Nov. 8, 1921.

UNITED STATES PATENT OFFICE.

YANDELL HENDERSON. OF NEW HAVEN, CONNECTICUT.

IIASK FOR THE INHALATION OF CARBON DIOXID.

Application filed April 7,

To all redo/'22 it may COilCij-Z Be it'known that I, Tanner}. Tl xnnusox, a citizen of the Jnited ltatcs res ding it Few Haven, in the co Haven and State of Connectitat, have invented a new and useful Improvement in Masks tor the Inhalation of Carbon Dionid: and I do hereby declare the following. when taken in connection with the L M drawings and the characters or rcrerence mark thereon. to be a full. vicar. and exact description oi? the same. and which said drawings constitute part of this application. and represent, in-

Figure l, a diagrammatic view showing a mask as in use.

Fig. :2, a plan vie of the mask.

Fig. 3, a view thereof in sile eleyation with the mixingtube partly broken away.

My invention relates to an improved mask "for the administration of carbon dioxid for the ventilation of the blood in the lung's after the administration of an anesthesia. the object being to provide a simple, convenient, and safe device for the purpose described.

With these ends in view, my lllY-LIltiOil consists in a mask provided with a mixing:- chamber constructed and arranged to waste the gas fed into it during exhalation or cessation of breathing, and to regulate by the volume of breathing, the amount of gas drawn into the inask during inhalation.

My invention further consists in further details of construction as will be hereinafter described and pointed out in the claims.

In carrying out my invention, as herein shown, I employ a mask 2 of ordinary form. made of metal or equivalent material and adapted to fit over the nose and mouth of the patient. In the lower edge ot'the mask, I locate a flat. rectangular mixing-tube 3, located in the plane of the front of the mask. open at both enos, and projecting into and out of the mask.

lVithin the projecting outer end of the mixing-tube 3. i locate the perforated inner end or a teed-tube ed at a ri 'ht angle to the said 1m and having I inner end closed. while its projecting outs-r end is formed with corrugations 5 for the application or" one end of a rubber supply tube 6. That portion of the feedtube located within the mixing-tube. is formed in its lower or outer series or" minute perforation shown by Fig. 3, face outwardly, as were,

Specification of Letters Patent.

1920. Serial No. 371,955.

from the mask. The size and number of the perforations 7 will be determined according to requirements. The gas, as it issues from the perforations 7 either wastes into the air or is drawn with the air into the mixingtube, the inner portion of which forms a mixing-chamber S in which'the gas and air are commingled before being drawn into the body of the mask.

The gas-supply tube 6 has its outer end connected through the medium of an ordinary capillary, which is not shown, but which is located at the point 9, with the limb 10 of a T tube connected by a reducingvalve 11 with a tank 12 of carbon dioxid of the best beverage quality. The branch 13 of the T tube aforesaid, is immersed in a vessel 14 of i ater serving both as a gage and as an escape-valve to prevent any excessive pressure on the capillary. I am thus enabled to control the amount of carbon dioxid supplied under the maximum pressure to the mask.

Supposing the device to be in use, it depends upon the patients own breathing to draw the minute quantities of gas expelled under pressure from the perforations in the teed-tube 6, inward around the tube 4: into the mixing-chamber S of the mixing-tube, from which it is drawn into the mask and inhaled. During exhalation or cessation of breathing. the gas merely wastes into the outside air; during inspiration, it mixes with the inspired air. as described. The operator controls the administration accordingto the reactions of the patient who receives approximately one-half of the gas which the apparatus measures oit per minute. The percentage of carbon dionid in the inspired air, therefore, depends upon the volume of breathing, and the administration will be cont-rolled accordingly.

What I particularly wish to emphasize is that by constructing my 'nproved mask so as to waste the gas during expiration or cessation of breathing, and to utilize it under control only duringinspiration, when the amount inspired will depend upon the volume of breathing, I provide the maximum of safety in the administration of the gas.

The beneficial effects observed are (a an augmentation of breathing; which rapidly ventilates the anesthetic out of the blood in the lungs, (a) markedly less post-operative nausea and vomiting, (0) a powerful stimulant effect upon the circulation without sub sequent relapse or unfavorable consequences, ((3) a possible restoration of intestinal tonus.

I claim:

1. A mask for the administration of carbon dioxid for the ventilation of the'blood in the lungs, the said mask having a mixingchamber opening into its interior and into the atmosphere and the said mixing-chamber containing a gas-distributer formed with openings positioned to waste the gas during expiration or cessation of breathing and to permit the gas to be drawn into the mask, mixed with outside air, during inspiration.

2. A mask for the administration of carbon dioxid for the ventilation of the blood in the lungs, the said mask having a mixingchamber opening into its interior and also into the atmosphere, and the said mixingchamber receiving a feed-tube provided with a plurality of minute perforations positioned to waste the gas during expiration or cessation of breathing and to permit the gas to be drawn into the mask, mixed with outside air, during inspiration.

A mask for the administration of carbon dioxid for the ventilation of'the blood in the lungs, the said mask having mounted in it a mixing-tube opening at its inner end I in the lungs, the said mask having mounted in it a mixing-tube opening into its exterior and also into the atmosphere, and the said mixing-tube receiving a feed-tube mounted in its projecting end at a right angle thereto and formed with a plurality of minute outwardly opening perforations, whereby the gas wastes into the outer air during eXpiration or cessation of breathing and is drawn into the mask, mixed with outside air, during inspiration.

In testimony whereof, I have signed this specification in the presence of two subscribing witnesses.

' YANDELL HENDERSON. Htnesses J. HAROLD 'FLYNN, FREDERIC C. EARLE. 

